The necessary energy to establish communication comes from a generator incorporated in the telephone. When the handle is activated, a condenser is charged, so communication can be established. When communication begins to fail, the energy can be recharged by activating the handle again. This process can be repeated as many times as desirable.
All the Batteryless telephones include a relay built in the circuit board. Most of our telephones are built with polymer alloy providing high impact resistance, fireproof, stability to ultra-violet light and excellent chemical resistance.
The Batteryless telephone systems allows communication in hazardous areas as indicated in the diagram bellow. In this case the system permits also up to 24 extensions.